18109076081 has 2 divisors, whose sum is σ = 18109076082. Its totient is φ = 18109076080.

The previous prime is 18109076057. The next prime is 18109076101. The reversal of 18109076081 is 18067090181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17966989681 + 142086400 = 134041^2 + 11920^2 .

It is a cyclic number.

It is not a de Polignac number, because 18109076081 - 2⁶ = 18109076017 is a prime.

It is a super-2 number, since 2×18109076081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18109072081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9054538040 + 9054538041.

It is an arithmetic number, because the mean of its divisors is an integer number (9054538041).

Almost surely, 2^18109076081 is an apocalyptic number.

It is an amenable number.

18109076081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18109076081 is an equidigital number, since it uses as much as digits as its factorization.

18109076081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 41.

The spelling of 18109076081 in words is "eighteen billion, one hundred nine million, seventy-six thousand, eighty-one".